jump.c (rtx_renumbered_equal_p): Do not call subreg_regno_offset for unrepresentable subregs or treat them as...

	* jump.c (rtx_renumbered_equal_p): Do not call subreg_regno_offset
	for unrepresentable subregs or treat them as equal to other regs
	or subregs with the same register number.

From-SVN: r138804